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Abstract

The NiII atom in the title compound, [Ni(C12H8NO2)2(H2O)4], exists in an all-trans octa­hedral coordination environment. The 3-(4-pyrid­yl)benzoate ligand binds to Ni atom through the pyridyl N atom; the pyridine and benzene rings are oriented at a dihedral angle of 26.27 (10)°. Adjacent complexes are linked by O—HO hydrogen bonds, forming a three-dimensional network. The metal atom lies on a special position of 2 site symmetry in the crystal structure.

Related literature

The 3-(pyridin-4-yl)benzoate unit is fairly rigid like the nicotinate unit, which also forms a similar zwitterionic nickel derivative; see: Batten & Harris (2001).

Acknowledgments

This work was supported by the Guangxi Graduate Education Innovation Program (2009106020703M44) and the University of Malaya.

supplementary crystallographic
information

Experimental

3-(Pyridin-4-yl)benzoic acid was purchased from a chemical supplier. The reagent
(0.199 g, 1 mmol) and sodium hydroxide (0.040 g, 1 mmol) were mixed with
nickel(II) nitrate hexahydrate (0.150 g, 0.5 mmol) in water (10 ml). The
mixture was placed in a 15 ml Teflon-lined autoclave and heated at 423 K for
48 h. The autoclave was cooled over 12 h at a rate of 5 K an hour. Green
crystals were isolated by hand (yield ca 60% based on Ni).

Refinement

Carbon-bound hydrogen atoms were generated geometrically and were
constrained to ride on their parent atoms [C–H = 0.95 Å; Uiso(H)
=1.2Ueq(C)]. The water H-atoms were located in a difference Fourier
map, and were refined with a distance restraint of O–H 0.84±0.01 Å; their
temperature factors were refined.